A woman receives the rVSV-ZEBOV Ebola vaccine at a clinical trial in Conakry, Guinea. The vaccine appears effective after only one shot. Cellou Binani/AFP/Getty Images hide caption

itoggle caption Cellou Binani/AFP/Getty Images

The Ebola vaccine from a trial in Guinea needs to be kept at a temperature of minus 60 degrees Celsius, the World Health Organization says. Storage devices use jet fuel to keep the right temperature for up to five days in the field. Sean Hawkey/Sean Hawkey hide caption

itoggle caption Sean Hawkey/Sean Hawkey

The bar chart tells all: That's how eighth-graders at Bakgatle Community Junior Secondary School in Botswana can compare the HIV infection rate of older men and of teenage boys. Don Boroughs for NPR hide caption

itoggle caption Don Boroughs for NPR

Trevor Noah will appear in Santa Monica on Tuesday, then head to the U.K. for the Edinburgh Festival Fringe in late August. Don't worry, he'll be back in time for his debut as the Daily Show host. Michael O'Brian/Flickr hide caption

itoggle caption Michael O'Brian/Flickr

Transgender performers walk backstage during an event to mark World AIDS Day in 2013. A new WHO report demonstrates extremely rates of HIV infection among transgender women in 15 countries. Prakash Mathema/AFP/Getty Images hide caption

itoggle caption Prakash Mathema/AFP/Getty Images

A baby helps make history. The Kenyan child is receiving the new malaria vaccine — the first ever that can wipe out a parasite — as part of a clinical trial. Karel Prinsloo/AP hide caption

itoggle caption Karel Prinsloo/AP

Teacher Kim Song Bo lectures at a new school that is training students to make prosthetic limbs. Classes are held at the Center for the Rehabilitation of the Paralyzed in Dhaka, Bangladesh. Amy Yee/NPR hide caption

itoggle caption Amy Yee/NPR

British actress Zawe Ashton and Agnes Pareyio, who underwent female genital mutilation as a girl in Kenya, are two of the activists featured in "Stop Cutting Our Girls," a documentary opposing the practice. Pontso Mafethe/Courtesy of Pontso Mafethe hide caption

itoggle caption Pontso Mafethe/Courtesy of Pontso Mafethe

The area around the confluence of the Silverthrone and Klinaklini glaciers in southwestern British Columbia provides a glimpse into how the terrain traveled by Native Americans in Pleistocene times may have appeared. David J. Meltzer/Science hide caption

itoggle caption David J. Meltzer/Science

Slum dwellers near Calcutta get their water from a municipal pipe. Water coming out of the tap on the left is for bathing and so is untreated. The blue Zimba chlorinator is hooked up to the tap on the right, which is used for drinking water. Courtesy of Suprio Das/Zimba hide caption

itoggle caption Courtesy of Suprio Das/Zimba

"What has happened in the last ten years, has been a remarkable increase in actual number of people who are dying or are not able to get better because they carry a resistant infection."--Ramanan Laxminarayan Courtesy of TEDMED hide caption

itoggle caption Courtesy of TEDMED